If you do the spoof then your system will only think that it's on 5.5.1, when in reality all the internal stuff is still 5.3.2. I have done it and haven't had any problems, it scared me for a bit because I couldn't get the exploit to run, but after a few tries everything worked out just fine.

After the spoof in your system settings it will say it's on 5.5.1, but the inside is still 5.3.2

So none of the latest update features are present.
Like if I was to have a game required to use this certain feature I could play it?

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Yes, if there was a special feature that is only present in a newer update, and a game needed that feature, then you would not be able to use that feature in the game. The only thing the spoof does is prevent version checks from seeing that you're on an older firmware (except for EShop, there's a temporary patch you have to run to use that).

So far there have been no new features that do that though, so it's fine. And you can always update fully if you ever feel like it.

Very confused by this statement. I thought the spoof was permanent, never unable to undo. In other words if we spoof we can't ever return to virgin 5.3.2 and run an official update.

I've been sitting on unmodded 5.3.2, waiting for the day we get a reversible way to emulate the latest firmware (with online play and eshop) while still keeping the 5.3.2 exploit alive for homebrew.
So far, the spoof technique seems to offer everything I want except the "reversible" part. But you say there remains an option to fully update?

Very confused by this statement. I thought the spoof was permanent, never unable to undo. In other words if we spoof we can't ever return to virgin 5.3.2 and run an official update.

I've been sitting on unmodded 5.3.2, waiting for the day we get a reversible way to emulate the latest firmware (with online play and eshop) while still keeping the 5.3.2 exploit alive for homebrew.
So far, the spoof technique seems to offer everything I want except the "reversible" part. But you say there remains an option to fully update?

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000500101000400A is the system firmware, you can download it with nusgrabber. It comes with a .tik file, which means you can install it with WUPinstaller.

But also, why would you ever need to revert the spoof? If you ever wanted to sell the console, you'd just do a system format, there's no other reason you could possibly need to undo the spoof.

Are you saying a system format or manual firmware install could eliminate signs the spoof ever existed and leave me with a fully functional un-modded wii-u?

The reason I've steered away from sppofing is because I've read, in very clear terms, the spoof is permanent and cannot be reversed. I've inferred from that, if the mod ever became a problem to play new games online or access the store, that theres a good chance I could not completely reverse the mod, not completely return to stock, not completely use official updates.

Are you saying a system format or manual firmware install could eliminate signs the spoof ever existed and leave me with a fully functional un-modded wii-u?

The reason I've steered away from sppofing is because I've read, in very clear terms, the spoof is permanent and cannot be reversed. I've inferred from that, if the mod ever became a problem to play new games online or access the store, that theres a good chance I could not completely reverse the mod, not completely return to stock, not completely use official updates.

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I told you that you CAN update your whole system by using WUPinstaller...
Also, when a new update comes out, your version.bin will state an older version, and thus the system will allow you to update the normal way as well.

The version spoof isn't a "mod" in the traditional sense. All it is, is that you've installed a newer version of the version.bin file, there is no actual modification, all your system files are still official, one of your files is simply at a newer state.

So, if a game ever comes out that needs actual new core functions from a new update, you can, as I said, install that update using WUPinstaller in the situation that your version.bin is already on the latest so you couldn't update normally. Otherwise you would just update normally.

So again, there is absolutely no reason you would need to downgrade your version.bin.

Thank you kakkoii, I didn't understand that the spoof doesn't prevent official updates if one were to choose to abandon the exploitable kernel and go "legit". It's unusual that the spoof has been described as permanent, when really it is non-downgradable, there is a big difference between those terms.